Ok, so, the problem has been in the game since LEGION. Despite what the rules say about: You cannot transfer a character from an account with the latest expansion to an account without the expansion
Whats worse is that Blizzard has made ZERO effort over the years to fix this bug, and would rather all of us players ignore it. Its so bad, that despite this being CLEARLY listed as being against the rules, people have posted guides on how to do it, here on the forums.
IMO, what makes this really bad is that-- even if you don’t consider it an exploit-- it IS pay-to-win at a minimum, because you are buying a SECOND WoW account, upgrading it to DF, xfering your toon to that acc, getting your level 70 == gear, and THEN you are transfering your toon back to a SL-locked account so you can stay in the level 60 bracket.
And before anyone suggests this is twinking-- No, twinking is min-maxing within the rules of the game. THIS is straight up BUYING POWER.